---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: cilium
  namespace: kube-system
spec:
  updateStrategy:
    type: "RollingUpdate"
    rollingUpdate:
      # Specifies the maximum number of Pods that can be unavailable during the update process.
      # The current default value is 1 or 100% for daemonsets; Adding an explicit value here
      # to avoid confusion, as the default value is specific to the type (daemonset/deployment).
      maxUnavailable: "100%"
  selector:
    matchLabels:
      k8s-app: cilium
      kubernetes.io/cluster-service: "true"
  template:
    metadata:
      labels:
        k8s-app: cilium
        kubernetes.io/cluster-service: "true"
      annotations:
        # This annotation plus the CriticalAddonsOnly toleration makes
        # cilium to be a critical pod in the cluster, which ensures cilium
        # gets priority scheduling.
        # https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/
        scheduler.alpha.kubernetes.io/critical-pod: ''
        scheduler.alpha.kubernetes.io/tolerations: >-
          [{"key":"dedicated","operator":"Equal","value":"master","effect":"NoSchedule"}]
{% if cilium_enable_prometheus %}
        prometheus.io/scrape: "true"
        prometheus.io/port: "9090"
{% endif %}
    spec:
      serviceAccountName: cilium
      initContainers:
        - name: clean-cilium-state
          image: docker.io/library/busybox:1.28.4
          imagePullPolicy: IfNotPresent
          command: ['sh', '-c', 'if [ "${CLEAN_CILIUM_STATE}" = "true" ]; then rm -rf /var/run/cilium/state; rm -rf /sys/fs/bpf/tc/globals/cilium_*; fi']
          volumeMounts:
            - name: bpf-maps
              mountPath: /sys/fs/bpf
            - name: cilium-run
              mountPath: /var/run/cilium
          env:
            - name: "CLEAN_CILIUM_STATE"
              valueFrom:
                configMapKeyRef:
                  name: cilium-config
                  optional: true
                  key: clean-cilium-state
      containers:
        - image: {{ cilium_image_repo }}:{{ cilium_image_tag }}
          imagePullPolicy: Always
          name: cilium-agent
          command: ["cilium-agent"]
          args:
            - "--debug=$(CILIUM_DEBUG)"
            - "--kvstore=etcd"
            - "--kvstore-opt=etcd.config=/var/lib/etcd-config/etcd.config"
            - "--disable-ipv4=$(DISABLE_IPV4)"
{% if cilium_enable_prometheus %}
          ports:
            - name: prometheus
              containerPort: 9090
{% endif %}
          lifecycle:
            postStart:
              exec:
                command:
                  - "/cni-install.sh"
            preStop:
              exec:
                command:
                  - "/cni-uninstall.sh"
          env:
            - name: "K8S_NODE_NAME"
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: "CILIUM_DEBUG"
              valueFrom:
                configMapKeyRef:
                  name: cilium-config
                  key: debug
            - name: "DISABLE_IPV4"
              valueFrom:
                configMapKeyRef:
                  name: cilium-config
                  key: disable-ipv4
{% if cilium_enable_prometheus %}
            # Note: this variable is a no-op if not defined, and is used in the
            # prometheus examples.
            - name: "CILIUM_PROMETHEUS_SERVE_ADDR"
              valueFrom:
                configMapKeyRef:
                  name: cilium-metrics-config
                  optional: true
                  key: prometheus-serve-addr
{% endif %}
            - name: "CILIUM_LEGACY_HOST_ALLOWS_WORLD"
              valueFrom:
                configMapKeyRef:
                  name: cilium-config
                  optional: true
                  key: legacy-host-allows-world
            - name: "CILIUM_SIDECAR_ISTIO_PROXY_IMAGE"
              valueFrom:
                configMapKeyRef:
                  name: cilium-config
                  key: sidecar-istio-proxy-image
                  optional: true
            - name: "CILIUM_TUNNEL"
              valueFrom:
                configMapKeyRef:
                  key: tunnel
                  name: cilium-config
                  optional: true
            - name: "CILIUM_MONITOR_AGGREGATION_LEVEL"
              valueFrom:
                configMapKeyRef:
                  key: monitor-aggregation-level
                  name: cilium-config
                  optional: true
          resources:
            limits:
              cpu: {{ cilium_cpu_limit }}
              memory: {{ cilium_memory_limit }}
            requests:
              cpu: {{ cilium_cpu_requests }}
              memory: {{ cilium_memory_requests }}
          livenessProbe:
            exec:
              command:
                - cilium
                - status
            # The initial delay for the liveness probe is intentionally large to
            # avoid an endless kill & restart cycle if in the event that the initial
            # bootstrapping takes longer than expected.
            initialDelaySeconds: 120
            failureThreshold: 10
            periodSeconds: 10
          readinessProbe:
            exec:
              command:
                - cilium
                - status
            initialDelaySeconds: 5
            periodSeconds: 5
          volumeMounts:
            - name: bpf-maps
              mountPath: /sys/fs/bpf
            - name: cilium-run
              mountPath: /var/run/cilium
            - name: cni-path
              mountPath: /host/opt/cni/bin
            - name: etc-cni-netd
              mountPath: /host/etc/cni/net.d
            - name: docker-socket
              mountPath: /var/run/docker.sock
              readOnly: true
            - name: etcd-config-path
              mountPath: /var/lib/etcd-config
              readOnly: true
            - name: cilium-certs
              mountPath: {{ cilium_cert_dir }}
              readOnly: true
          securityContext:
            capabilities:
              add:
                - "NET_ADMIN"
            privileged: true
      hostNetwork: true
      volumes:
        # To keep state between restarts / upgrades
        - name: cilium-run
          hostPath:
            path: /var/run/cilium
        # To keep state between restarts / upgrades
        - name: bpf-maps
          hostPath:
            path: /sys/fs/bpf
        # To read docker events from the node
        - name: docker-socket
          hostPath:
            path: /var/run/docker.sock
        # To install cilium cni plugin in the host
        - name: cni-path
          hostPath:
            path: /opt/cni/bin
        # To install cilium cni configuration in the host
        - name: etc-cni-netd
          hostPath:
            path: /etc/cni/net.d
        # To read the etcd config stored in config maps
        - name: etcd-config-path
          configMap:
            name: cilium-config
            items:
              - key: etcd-config
                path: etcd.config
        # To read the k8s etcd secrets in case the user might want to use TLS
        - name: cilium-certs
          hostPath:
              path: {{ cilium_cert_dir }}

      restartPolicy: Always
      tolerations:
        - effect: NoSchedule
          key: node-role.kubernetes.io/master
        - effect: NoSchedule
          key: node.cloudprovider.kubernetes.io/uninitialized
          value: "true"
        # Mark cilium's pod as critical for rescheduling
        - key: CriticalAddonsOnly
          operator: "Exists"
